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Its either going to be the screen or the cable going from the screen to the motherboard is bad. My suggestion if your notebook is under warranty, try to get the screen and the cable replaced. That way if the problem still exists then you know for sure its a motherboard problem. Hope this helps.

Ok, to resolve this you will need to troubleshoot a little further.Get hold of an external monitor and plug it up to the laptop, switch screens with the keyboard if you have to, if the colour is still the same then i'm afraid its the video card thats faulty and you will have to have it looked at